Abstract
Two new tetraamide calix[4](aza)crowns (5a, 5b) were synthesized and used for optical anion sensors. Addition of host 5a or 5b to the p-NO 2C6H4O- anion in CHCl3 resulted in decreasing absorption of band at 423 nm and the yellow solution of p-NO2C6H4O- anion became colorless because of the formation of host-guest complexes between host 5a or 5b and p-NO2C6H4O-. The fluorescence response was observed in the presence of anions such as p-NO2C 6H4O-, F-, H2PO 4-, and the receptors 5a and 5b were highly selective toward p-NO2C6H4O-. The degree of change in the emission intensity was in the order of p-NO2C 6H4O->F->H2PO 4-≫Cl-, Br-, I-. The fluorescence spectroscopy titration experiments indicated the formation of a 1:1 stoichiometry complex between receptor 5a (or 5b) and anion by nonlinear fitting curve.
| Original language | English |
|---|---|
| Pages (from-to) | 416-420 |
| Number of pages | 5 |
| Journal | Acta Chimica Sinica |
| Volume | 63 |
| Issue number | 5 |
| State | Published - 2005 |
| Externally published | Yes |
Keywords
- Anion recognition
- Fluorescence
- Sensing
- Synthesis
- Tetraamide calix[4](aza)crown